CN111424176A - Treatment method for precipitation slag in cyanide barren solution - Google Patents
Treatment method for precipitation slag in cyanide barren solution Download PDFInfo
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- CN111424176A CN111424176A CN202010117177.5A CN202010117177A CN111424176A CN 111424176 A CN111424176 A CN 111424176A CN 202010117177 A CN202010117177 A CN 202010117177A CN 111424176 A CN111424176 A CN 111424176A
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- precipitation slag
- barren solution
- precipitation
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- 239000002893 slag Substances 0.000 title claims abstract description 86
- 238000001556 precipitation Methods 0.000 title claims abstract description 63
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000010949 copper Substances 0.000 claims abstract description 35
- 239000003792 electrolyte Substances 0.000 claims abstract description 27
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000011084 recovery Methods 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 79
- 239000011701 zinc Substances 0.000 claims description 54
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 17
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 claims description 12
- PDZKZMQQDCHTNF-UHFFFAOYSA-M copper(1+);thiocyanate Chemical compound [Cu+].[S-]C#N PDZKZMQQDCHTNF-UHFFFAOYSA-M 0.000 claims description 9
- 238000005868 electrolysis reaction Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 5
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 claims description 5
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 5
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 5
- 239000008151 electrolyte solution Substances 0.000 claims description 4
- XDAHMMVFVQFOIY-UHFFFAOYSA-N methanedithione;sulfane Chemical compound S.S=C=S XDAHMMVFVQFOIY-UHFFFAOYSA-N 0.000 claims description 3
- 239000012071 phase Substances 0.000 description 12
- 229910052984 zinc sulfide Inorganic materials 0.000 description 12
- 239000007788 liquid Substances 0.000 description 9
- 150000003751 zinc Chemical class 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 7
- 229910052737 gold Inorganic materials 0.000 description 7
- 239000010931 gold Substances 0.000 description 7
- 239000012141 concentrate Substances 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- DOBRDRYODQBAMW-UHFFFAOYSA-N copper(i) cyanide Chemical compound [Cu+].N#[C-] DOBRDRYODQBAMW-UHFFFAOYSA-N 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- WGPCGCOKHWGKJJ-UHFFFAOYSA-N sulfanylidenezinc Chemical compound [Zn]=S WGPCGCOKHWGKJJ-UHFFFAOYSA-N 0.000 description 4
- 150000001879 copper Chemical class 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 150000002505 iron Chemical class 0.000 description 3
- 230000020477 pH reduction Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229920001661 Chitosan Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- YAGKRVSRTSUGEY-UHFFFAOYSA-N ferricyanide Chemical compound [Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] YAGKRVSRTSUGEY-UHFFFAOYSA-N 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000012629 purifying agent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000563 toxic property Toxicity 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/08—Sulfides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/12—Electrolytic production, recovery or refining of metals by electrolysis of solutions of copper
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
- C25C7/06—Operating or servicing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for treating precipitation slag of cyanide barren solution, which comprises the following steps: (1) putting the precipitation slag of the cyanide barren solution into an alkaline sulfide solution, reacting at normal temperature for 20-60 min to obtain a new slag phase with ZnS as a main component, and further completing the recovery of Zn element in the precipitation slag of the cyanide barren solution; (2) cu (CN) is carried after the Zn element is recovered3 2‑The ionic solution is used as electrolyte, directly used as electrolyte and then electrolyzedAnd recovering the metal copper. The method provided by the invention is used for environment-friendly full-wet recovery treatment of the cyanide barren solution precipitation slag, so that the sulfide solution is directly converted into the precipitation slag, valuable elements Zn and Cu in the precipitation slag are efficiently separated and recovered, and harmlessness is thoroughly realized.
Description
Technical Field
The invention relates to the technical field of metallurgical slag resource utilization, in particular to a method for treating precipitated slag in cyanide barren solution.
Technical Field
As the first gold producing country, cyanidation leaching of gold concentrate is the most common gold extraction method in China. Because of the extremely toxic property of cyanide, the cyanide-containing barren solution generated after cyaniding and gold extraction becomes important for the environmental protection and control in the gold industry.
In recent years, the pressure of domestic environmental protection is increased day by day, and most gold smelting enterprises adopt an acidification method for simply treating heavy metal elements such as Cu and the like in cyanide-containing barren solution and returning the neutralized liquid to the leaching process for continuous recycling due to the consideration of cost; the continuous closed cycle use is adopted to generate the cyanogen-containing barren solution with high concentration/high salinity, and the environment-friendly, economic and reasonable treatment technology is not available at present.
For the high-concentration/high-salinity cyanogen-containing barren solution, the only suitable treatment method in the future is a precipitation method mainly comprising iron salt, zinc salt, copper salt and the like. Iron salt precipitation: patent CN105523663B discloses a treatment process of electroplating wastewater, wherein, in step 5, ferrous salt and hydrogen peroxide are adopted as a precipitator and an oxidant to precipitate heavy metal and cyanide, so that the wastewater reaches the discharge standard; however, the ferricyanide formed is exceptionally stable and is of little value for recycling as a hazardous solid waste. Zinc salt precipitation method: patent CN104528899A proposes a coking wastewater purifying agent and a preparation method and application thereof, and utilizes a coagulant consisting of iron salt, aluminum salt, magnesium salt and zinc salt; the coagulant aid consists of PAM and bentonite; the accelerant consists of zeolite powder and chitosan and is used for reducing COD, ammonia nitrogen, chroma, volatile phenol and cyanide concentration in the coking wastewater. Copper salt precipitation: the method mainly removes cyanide by using cuprous cyanide formed by cuprous ions and cyanide radicals, but because the price of cupric salt is expensive and the wastewater contains high-concentration sulfurUnder cyanide conditions, cuprous thiocyanide is formed, which can significantly increase the consumption of copper salts. At present, the research is more extensive, namely, cyanide ions are precipitated by zinc salt, and the generated zinc salt precipitation slag comprises Zn (CN)2、ZnCu(CN)3CuCN, and small amounts of CuSCN, and the like. However, the problem is that the method is not industrially applied because the cost of the barren liquor treatment technology is unbearable for gold enterprises and the reasonable and efficient sediment treatment technology is lacked. The invention patent CN109385538A realizes the recycling of zinc salt by using zinc salt purification and carbonate transfer, but in the process, the zinc salt purification and the copper cyanide complex in the barren solution are deposited in the slag together, when the carbonate transfer is used, although zinc is separated, the copper cyanide complex enters the solution again and returns to the flow, and the slag treatment uses an acidification method, thereby failing to solve the disadvantages caused by acidification.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for treating the precipitation slag in the cyanided barren solution, which realizes harmlessness by respectively recovering Zn and Cu in the slag in the form of zinc blende (ZnS) and metallic copper.
In order to achieve the purpose, the invention adopts the technical scheme that:
a treatment method of the sediment slag for cyaniding barren solution comprises the following steps:
(1) putting the precipitation slag of the cyanide barren solution into an alkaline sulfide solution, reacting at normal temperature for 20-60 min to obtain a new slag phase with ZnS as a main component, and further completing the recovery of Zn element in the precipitation slag of the cyanide barren solution;
(2) cu (CN) carried after recovering Zn element in the step (1)3 2-Taking the ionic solution as electrolyte, and recovering the metal copper by electrolyzing the electrolyte;
wherein the main component of the precipitation slag of the cyanide barren solution comprises Zn (CN)2、ZnCu(CN)3CuCN and CuSCN.
Furthermore, the content of Zn element in the precipitation slag is 20-40%, and the content of Cu element is 5-20%.
Further, when the precipitation slag of the cyanide barren solution is put into the alkaline sulfide solution, the liquid-solid ratio of the alkaline sulfide solution to the precipitation slag is 2-4: 1, and the addition amount of the alkaline sulfide is 0.9-2 times of the theoretical amount of zinc in the precipitation slag.
Further, the pH value of the alkaline sulfide solution is 8-14.
Further, after the metal copper is recovered by the electrolytic solution, the alkaline sulfide is added to the electrolytic solution and recycled.
Further, when the metal copper is recovered by electrolyzing the electrolyte, the method comprises the following steps: applying 80-300A/m2The cathode current density of the electrolytic cell is that the electrolytic solution is electrolyzed for 2-4 hours by an electrolysis method at the temperature of 20-80 ℃, so that the direct recovery of the metal copper is realized.
Further, the alkaline sulfide is one or more of sodium sulfide, sodium hydrosulfide, hydrogen sulfide and carbon disulfide.
The invention provides a method for treating the sediment slag of cyanide barren solution, which comprises the following steps of taking Zn (CN) as a main component2、ZnCu(CN)3Directly placing the cyaniding barren solution precipitation slag of CuCN and a small amount of CuSCN into an alkaline sulfide solution, reacting for a period of time at normal temperature, and performing solid-liquid separation to obtain a new slag phase mainly containing ZnS, so that Zn element in the cyaniding barren solution precipitation slag is recovered; and Cu (CN) is carried after the Zn element is recovered3 2-The method provided by the invention is used for carrying out environment-friendly full wet recovery treatment on the precipitation slag of the cyanide barren solution, realizes direct conversion of the precipitation slag by using sulfide solution, enables valuable elements Zn and Cu in the precipitation slag to be efficiently separated and recovered, and thoroughly realizes harmlessness.
Detailed Description
The present invention is described in further detail below by way of specific examples.
The invention provides a method for treating precipitation slag of cyanide barren solution, which comprises the following steps:
(1) putting the precipitation slag of the cyanide barren solution into an alkaline sulfide solution, reacting at normal temperature for 20-60 min to obtain a new slag phase with ZnS as a main component, (wherein the new slag phase can be sold as a zinc concentrate product or directly used for zinc extraction), and further completing the recovery of Zn element in the precipitation slag of the cyanide barren solution; wherein the liquid-solid ratio of the alkaline sulfide solution to the precipitation slag is 2-4: 1, the addition amount of the alkaline sulfide is 0.9-2 times of the theoretical amount of zinc in the precipitation slag, and the pH value of the alkaline sulfide solution is 8-14.
Wherein, when recovering Zn element in the precipitation slag of the cyanide barren solution, the main reaction equation is as follows:
Zn2++2CN-→Zn(CN)2↓
(2) cu (CN) carried after recovering Zn element in the step (1)3 2-Using ionic solution as electrolyte, using the liquid as electrolyte, applying 80-300A/m2The cathode current density of (2) is to electrolyze the electrolyte for 2 to 4 hours at the temperature of 20 to 80 ℃ by an electrolysis method to realize the electrolysis of the metal copperDirectly recovered and recycled by adding alkaline sulfide into the electrolyte.
Wherein, when the metal copper in the precipitation slag of the cyanide barren solution is recovered, the reaction equation is involved as follows:
as a preferred embodiment, the main component of the precipitation slag of the cyanide barren solution comprises Zn (CN)2、ZnCu(CN)3CuCN and CuSCN, wherein the content of Zn element in the precipitation slag is 20-40%, and the content of Cu element is 5-20%.
As a preferred embodiment, the alkaline sulfide is one or more of sodium sulfide, sodium hydrosulfide, hydrogen sulfide and carbon disulfide.
The invention provides a method for treating the sediment slag of cyanide barren solution, which comprises the following steps of taking Zn (CN) as a main component2、ZnCu(CN)3Directly placing the cyaniding barren solution sedimentation slag of CuCN and a small amount of CuSCN into an alkaline sulfide solution, reacting for a period of time at normal temperature, and carrying out solid-liquid separation to obtain a new slag phase (the new slag phase can be sold as a zinc concentrate product or directly used for extracting zinc) mainly containing ZnS, so that the Zn element in the cyaniding barren solution sedimentation slag can be recovered, and the Cu element in the sedimentation slag can be Cu (CN)3 2-Cu (CN) in which ion forms directly enter liquid phase and Zn element is recovered3 2-The ion concentration is 10 to 20 times higher than the copper concentration in the cyanided barren solution; then recovering Zn element with Cu (CN)3 2-The ionic solution is directly used as electrolyte, and the recovery of the Cu element in the precipitation slag can be accelerated by electrolyzing the electrolyte to recover the metal copper. In a word, the method provided by the invention carries out environment-friendly full-wet recovery treatment on the precipitation slag of the cyanide barren solution, realizes direct conversion of the precipitation slag by sulfide solution, enables valuable elements Zn and Cu in the precipitation slag to be efficiently separated and recovered, and thoroughly realizes harmlessness.
The following provides a specific description of a method for treating a precipitate slag of a cyanide barren solution by using examples.
Example 1
The embodiment provides a method for treating precipitation slag of cyanide barren solution, which comprises the following steps:
(1) 100g of cyanide barren solution precipitation slag containing 21.9g of zinc element is treated according to the liquid-solid ratio of 2: 1, placing the solution in a sodium sulfide solution with the pH value of 10, reacting for 30min at normal temperature, and carrying out solid-liquid separation on the solution after reaction to obtain a new slag phase mainly comprising zinc blende (ZnS), wherein the new slag phase can be sold as a zinc concentrate product or directly used for zinc extraction, so that the recovery of Zn element in the precipitation slag of the cyanidation barren solution is completed;
(2) cu (CN) carried after recovering Zn element in the step (1)3 2-The ionic solution was used as an electrolyte, and the electrolyte was applied at a rate of 150A/m2The cathode current density of (2) is that the electrolyte is electrolyzed for 2 hours by an electrolysis method at the temperature of 60 ℃, the metal copper is directly recovered, and sodium sulfide is added into the electrolyte for recycling.
Further, the main component of the precipitation slag of the cyanide barren solution comprises Zn (CN)2、ZnCu(CN)3CuCN and CuSCN, wherein the content of Zn element in the precipitation slag is 21.9 percent, and the content of Cu element is 5 percent.
Example 2
The embodiment provides a method for treating precipitation slag of cyanide barren solution, which comprises the following steps:
(1) 100g of cyanide barren solution precipitation slag containing 28.9g of zinc element is treated according to the liquid-solid ratio of 3: 1, placing the solution in a sodium hydrosulfide solution with the pH value of 9, reacting for 60min at normal temperature, and performing solid-liquid separation on the solution after reaction to obtain a new slag phase mainly comprising zinc blende (ZnS), wherein the new slag phase can be sold as a zinc concentrate product or directly used for zinc extraction, thereby completing the recovery of Zn element in the precipitation slag of the cyanidation barren solution;
(2) cu (CN) carried after recovering Zn element in the step (1)3 2-Using ionic solution as electrolyte, and applying 200A/m with the liquid as electrolyte2At a temperature of 50 ℃, and is electrified by an electrolysis methodAnd electrolyzing the electrolyte for 3 hours, directly recovering the metal copper, and adding sodium hydrosulfide into the electrolyte for recycling.
Further, the main component of the precipitation slag of the cyanide barren solution comprises Zn (CN)2、ZnCu(CN)3CuCN and CuSCN, wherein the content of Zn element in the precipitation slag is 28.9 percent, and the content of Cu element is 15 percent.
Example 3
The embodiment provides a method for treating precipitation slag of cyanide barren solution, which comprises the following steps:
(1) 100g of cyanide barren solution precipitation slag containing 30.1g of zinc element is treated according to the liquid-solid ratio of 5: 1, placing the solution in a hydrogen sulfide solution with the pH value of 12, reacting for 60min at normal temperature, and carrying out solid-liquid separation on the solution after reaction to obtain a new slag phase mainly comprising zinc blende (ZnS), wherein the new slag phase can be sold as a zinc concentrate product or directly used for zinc extraction, so that the recovery of Zn element in the precipitation slag of the cyanidation barren solution is completed;
(2) cu (CN) carried after recovering Zn element in the step (1)3 2-Using ionic solution as electrolyte, and using the liquid as electrolyte, applying 300A/m2The cathode current density of (2) is to electrolyze the electrolyte at a temperature of 40 ℃ for 4 hours by an electrolysis method, directly recover the metallic copper, and recycle the metallic copper by adding hydrogen sulfide into the electrolyte.
Further, the main component of the precipitation slag of the cyanide barren solution comprises Zn (CN)2、ZnCu(CN)3CuCN and CuSCN, wherein the content of Zn element in the precipitation slag is 30.1 percent, and the content of Cu element is 20 percent.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. A method for treating the sediment slag of cyanide barren solution is characterized by comprising the following steps:
(1) putting the precipitation slag of the cyanide barren solution into an alkaline sulfide solution, reacting at normal temperature for 20-60 min to obtain a new slag phase with ZnS as a main component, and further completing the recovery of Zn element in the precipitation slag of the cyanide barren solution;
(2) cu (CN) carried after recovering Zn element in the step (1)3 2-The ionic solution is used as electrolyte, and the metal copper is recovered by electrolyzing the electrolyte.
Wherein the main component of the precipitation slag of the cyanide barren solution comprises Zn (CN)2、ZnCu(CN)3CuCN and CuSCN.
2. The method as claimed in claim 1, wherein the content of Zn element in the precipitation slag is 20-40%, and the content of Cu element in the precipitation slag is 5-20%.
3. The method for treating the precipitation slag of the cyanide barren solution as claimed in claim 1, wherein when the precipitation slag of the cyanide barren solution is put into the alkaline sulfide solution, the liquid-solid ratio of the alkaline sulfide solution to the precipitation slag is 2-4: 1, and the addition amount of the alkaline sulfide is 0.9-2 times of the theoretical amount of zinc in the precipitation slag.
4. The method as claimed in claim 3, wherein the pH of the alkaline sulfide solution is between 8 and 14.
5. The method as claimed in claim 1, wherein the copper metal is recovered by electrolysis of the electrolyte and recycled by adding alkaline sulfide to the electrolyte.
6. The process according to claim 1, characterized in that, in the recovery of metallic copper by means of electrolytic electrolysis of the copper, it comprises: applying 80-300A/m2The cathode current density of the electrolytic cell is that the electrolytic solution is electrolyzed for 2-4 hours by an electrolysis method at the temperature of 20-80 ℃, so that the direct recovery of the metal copper is realized.
7. The method as claimed in any one of claims 1 to 6, wherein the alkaline sulfide is one or more of sodium sulfide, sodium hydrosulfide, hydrogen sulfide and carbon disulfide.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57120631A (en) * | 1981-01-19 | 1982-07-27 | Sumitomo Metal Ind Ltd | Separating and recovering method for zn component from substance containing zn |
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2020
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| CN109097792A (en) * | 2018-10-29 | 2018-12-28 | 东北大学 | A kind of electrolysis unit from low concentration cupric cyanide barren solution recycling copper and cyanide |
| CN109735715A (en) * | 2019-01-30 | 2019-05-10 | 东北大学 | A method of the short route green circulatory of lean solution containing cyanogen utilizes |
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